HELOC Repayment Phase Shock Calculator
One of the biggest risks of HELOCs is payment shock when the draw period ends. Our calculator helps you understand and prepare for this payment increase.
TL;DR: When your HELOC’s 10-year draw period ends, payments can jump 20-40% as you begin repaying principal. On $50,000 at 8.5%, payments rise from $354 to $434/month. Paying extra during the draw period dramatically reduces this shock.
What Is Repayment Shock?
Repayment shock is the dramatic increase in monthly payments when your HELOC transitions from:
- Draw period: Interest-only (or minimal) payments
- Repayment period: Full principal + interest payments
Example of Payment Shock
Scenario: $50,000 HELOC at 8.5%
| Phase | Payment | Increase |
|---|---|---|
| Draw Period (10yr) | $354/month (interest-only) | - |
| Repayment Period (20yr) | $434/month | +$80 (+23%) |
| If balance unchanged | $434/month | +$80/month |
Worst case: If you made interest-only payments for 10 years, your payment jumps $80+ per month.
Factors That Affect Payment Shock
1. Remaining Balance
- Higher balance = larger payment increase
- Paying down principal during draw period helps
2. Interest Rate at Transition
- Rate could be higher in 10 years
- Our stress test shows +1% scenario
3. Repayment Term
- Typically 20 years
- Some lenders offer 10-25 years
How to Minimize Payment Shock
1. Pay Principal During Draw Period
Even $100/month extra makes a big difference:
- $50,000 balance, 8.5%, paying $500/month (vs $354)
- After 10 years: Balance drops to ~$9,000
- Repayment payment: ~$75/month (vs $434 at full balance)
2. Refinance Before Repayment Starts
- Convert to fixed-rate home equity loan
- Refinance into your first mortgage
- Pay off with savings
3. Plan for the Increase
- Know exactly when your draw period ends
- Budget for the higher payment
- Consider refinancing 6-12 months before transition
Our Calculator Shows Payment Shock
Our tool estimates:
- Your draw period payment
- Estimated repayment period payment
- Percentage increase to expect
- Total cost if you don’t pay down principal
Frequently Asked Questions
How much will my HELOC payment increase after the draw period?
Expect a 20-40% increase. On $50,000 at 8.5%, interest-only is $354/month, while 20-year repayment is $434/month (+23%). If rates rise during your draw period, the increase could be even higher.
Can I avoid HELOC repayment shock?
Yes. Pay principal during the draw period to reduce your balance. Even $100-200 extra per month can cut your repayment payment by 50-80%. Alternatively, refinance into a fixed-rate loan before the draw period ends.
When does the HELOC repayment period start?
Typically 10 years after opening the HELOC. Mark this date on your calendar and start planning 2-3 years ahead. Consider refinancing 6-12 months before the transition.
What if I can’t afford the higher payment?
Options include: refinancing into a longer-term loan, converting to a fixed-rate home equity loan, or paying down the balance aggressively before transition. See our fixed-rate conversion guide for details.